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    <script>
        //ES6 允许给函数参数赋值初始值
        //1.形参初始值   具有默认值的参数，一般位置靠后
        // function add(a,b,c=10){
        //     return a+b+c;
        // };
        // let result=add(1,2);
        // console.log(result);

        //2.与解构赋值结合
        function connect({host='127.0.0.1',username,password,port}){
            console.log(host);
            console.log(username);
            console.log(password);
            console.log(port);
        }
        connect({
            // host:'localhost',
            username:'root',
            password:'root',
            port:3306
        })
    </script>
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